Text sizes shrink down when in edit mode

Hi there, 

I have a weird anomaly that I've experienced in 2 different sites that I'm working on. I have set the parameters of headings and body copy and when I'm in edit mode, everything looks great. However, as soon as I click save and exit edit mode my H1 text becomes huge. I can't change it because when I'm in edit mode it's perfect. I don't believe I have any CSS in either site that's conflicting with it. It's driving me crazy and the sites aren't presentable to clients as they look really bad. Can anyone help!? 

This screengrab is when I'm not in edit mode:

This screengrab is when I am in edit mode:

*UPDATE*
It's actually ALL text  – headings and body copy.

So I'm sizing things up in EDIT mode to fit in a certain area and it all looks great.
I click SAVE and everything gets bigger, text overlaps, things look really messy.

My current workaround is to work 'blind' on my layouts, clicking save to then see whether I've guessed correctly and put stuff in the right place. 

HELP!!! 😭

@tuanphan ?? Anybody!!

On 4/1/2023 at 12:45 AM, MelSH said:

*UPDATE*
It's actually ALL text  – headings and body copy.

So I'm sizing things up in EDIT mode to fit in a certain area and it all looks great.
I click SAVE and everything gets bigger, text overlaps, things look really messy.

My current workaround is to work 'blind' on my layouts, clicking save to then see whether I've guessed correctly and put stuff in the right place. 

HELP!!! 😭

@tuanphan ?? Anybody!!

What is page url? We can check easier

Thanks so much, it's:
https://ellipse-papaya-xllw.squarespace.com/config/

P: 123

NB. I'm using a second screen (32" 4K BenQ HDR) and I've scaled the resolution to 2560 x 1440) – I doubt this would make a difference as I've never had an issue with anything else, but thought I'd mention it just incase??

Thanks Tuanphan 👍

Anyone got any advice on this?

When I expand my browser window the text gets smaller, when I shrink my browser window the text gets larger!! It's happening on 2 site builds.
The text size in edit mode is different to the text size when I click save and when I expand and shrink my browser window. Site needs to go live tomorrow and I'm desperate for a solution!

I've attached a 10 sec movie of what's happening.